US Bridges

Fort. Duq Brg (up) over Ft Duq Br SB Alleg Rvr

Fair

Allegheny County, Pennsylvania · Fort Duquesne Bridge · Structure no. 000000000001023

Built
1959
66 years old
Condition
Fair
inspected April 2024
Type
Arch - Thru
Steel
Length
921 ft
1 main span
Daily traffic
10,891
2024 count
Owner
State
State Highway Agency

About this bridge

Fort. Duq Brg (up) over Ft Duq Br SB Alleg Rvr is a steel arch - thru carrying Fort. Duq Brg (up) over Ft Duq Br SB Alleg Rvr in Allegheny County, Pennsylvania. It was built in 1959, so it is 66 years old, older than the Pennsylvania average of 54.8 years.

The most recent inspection reported to the Federal Highway Administration rates it in fair condition with a lowest component rating of 5 out of 9. The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

It carries about 10,891 vehicles a day, roughly 4% of them trucks, projected to reach 18,512 by 2032. The structure is 921 ft (280.7 m) long and 58 ft wide. If it were closed, the detour would be 3.1 mi (5 km).

Location

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CarriesFort. Duq Brg (up)
CrossesFt Duq Br SB Alleg Rvr
LocationFort Duquesne Bridge
RouteInterstate 279
CountyAllegheny County
StatePennsylvania
Coordinates40.44417, -80.00913
Functional classUrban Principal Arterial - Interstate

Condition and inspection

Fair

The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

ComponentRatingMeaning
Deck5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Superstructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionApril 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry4: Meets minimum tolerable limits to be left in place as is
Waterway adequacy9: Superior to present desirable criteria
Approach roadway alignment7: Better than present minimum criteria
Operating rating42 US tons
Inventory rating25 US tons

Structure

Structure typeArch - Thru
MaterialSteel
DeckConcrete, cast-in-place
Main spans1 (+4 approach)
Design loadHS 20
Structure length921 ft (280.7 m)
Longest span423 ft (128.9 m)
Deck width58 ft (17.8 m)
Roadway width55 ft (16.8 m)
Vertical clearance over deck18 ft (5.4 m)

Traffic and service

Average daily traffic10,891 (2024)
Projected traffic18,512 by 2032
Trucks4%
Lanes on structure4
Traffic directionOne-way traffic
CarriesHighway
CrossesHighway and waterway
Detour if closed3.1 mi (5 km)
TollOn a free road
National Highway SystemYes
Strategic Highway NetworkInterstate STRAHNET route

Ownership and planned work

OwnerState Highway Agency
Maintained byState Highway Agency
Historic statusNot eligible for the National Register of Historic Places
Work proposedRehabilitation because of general structure deterioration or inadequate strength
Estimated improvement cost$3.5 million
NavigationNavigation control on waterway (bridge permit required)

Frequently asked questions

When was Fort. Duq Brg (up) over Ft Duq Br SB Alleg Rvr built?

It was built in 1959, making it 66 years old in 2025.

What condition is Fort. Duq Brg (up) over Ft Duq Br SB Alleg Rvr in?

The National Bridge Inventory rates it in fair condition. The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound. The last reported inspection was in April 2024.

How much traffic does Fort. Duq Brg (up) over Ft Duq Br SB Alleg Rvr carry?

About 10,891 vehicles per day (2024 count), of which roughly 4% are trucks.

How long is Fort. Duq Brg (up) over Ft Duq Br SB Alleg Rvr?

The structure is 921 ft (280.7 m) long with a longest span of 423 ft (128.9 m) and a deck 58 ft wide.

Who owns Fort. Duq Brg (up) over Ft Duq Br SB Alleg Rvr?

It is owned by the State Highway Agency.